Add CHECK on file descriptor in various IPC::ChannelHandle passed in.

content/common/gpu/gpu_channel_manager.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/gpu/gpu_channel_manager.h"
 
 #include "base/bind.h"
 #include "content/common/child_thread.h"
 #include "content/common/gpu/gpu_channel.h"
 #include "content/common/gpu/gpu_messages.h"
@@ skipping 77 matching lines @@
     gpu_channels_[renderer_id] = channel;
   else
     channel = NULL;
 
   if (channel.get()) {
     channel_handle.name = channel->GetChannelName();
 #if defined(OS_POSIX)
     // On POSIX, pass the renderer-side FD. Also mark it as auto-close so
     // that it gets closed after it has been sent.
     int renderer_fd = channel->TakeRendererFileDescriptor();
-    DCHECK_NE(-1, renderer_fd);
+    // Check the validity of |renderer_fd| for bug investigation.  Replace with
+    // normal error handling after bug fixed. See for details: crbug.com/95732.
+    CHECK_NE(-1, renderer_fd);
     channel_handle.socket = base::FileDescriptor(renderer_fd, true);
 #endif
   }
 
   Send(new GpuHostMsg_ChannelEstablished(channel_handle));
 }
 
 void GpuChannelManager::OnCloseChannel(
     const IPC::ChannelHandle& channel_handle) {
   for (GpuChannelMap::iterator iter = gpu_channels_.begin();
@@ skipping 30 matching lines @@
 void GpuChannelManager::LoseAllContexts() {
   MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&GpuChannelManager::OnLoseAllContexts,
                  weak_factory_.GetWeakPtr()));
 }
 
 void GpuChannelManager::OnLoseAllContexts() {
   gpu_channels_.clear();
 }